GM Service Manual Online
For 1990-2009 cars only

Pump Type

Engine RPO

Steering Gear RPO

Brakes RPO

Engine RPM

Relief Valve Settings kPa (PSI)

Hobourn S600

LG5

NXW or N40

JE3 or JE4

700

1 000-1 069(145-155)

Hobourn S600

LG5

NXW

JE4

750

1 000-1 069(145-155)

Hobourn S600

LG5

NXW

JE3

750

1 000-1 069(145-155)

Saginaw 235

LR0 or L50

N40

JE3 or JE4

600/650

786-807(114-117)

All pressures are with engine at normal operating temperature.